Question 1

Which of the following best describes a transposon?

Accepted Answer

A mobile DNA element that can change its position within the genome

Question 2

Transposons are considered 'mobile genetic elements.' What is a key feature that distinguishes them from viruses?

Accepted Answer

Transposons move only within the same genome and do not exist as independent genetic entities

Question 3

Which enzyme is essential for the movement of DNA transposons?

Accepted Answer

Transposase

Question 4

A transposon inserts itself into a functional gene, resulting in a loss of function. What is the most likely consequence?

Accepted Answer

A mutation will occur, potentially leading to disease or altered phenotype

Question 5

Which of the following statements about transposon movement is correct?

Accepted Answer

Transposons can move to any location in the genome, independent of sequence homology

Question 6

What is the difference between autonomous and nonautonomous transposons?

Accepted Answer

Autonomous transposons encode the enzymes necessary for their own movement, while nonautonomous transposons rely on enzymes from other transposons

Question 7

Which type of transposon uses an RNA intermediate during its movement?

Accepted Answer

Retrotransposons

Question 8

A student is studying the mechanism of transposon integration. Which of the following best describes the process that leads to duplication of the target site?

Accepted Answer

Transposase makes staggered nicks at the target site, and the gaps are filled in by host enzymes

Question 9

Which of the following is a consequence of homologous recombination between two transposons in direct orientation on the same chromosome?

Accepted Answer

Deletion of the region between the transposons

Question 10

Which class of transposable elements is currently active in vertebrate genomes and can increase copy number via an RNA intermediate?

Accepted Answer

Retrotransposons (Class I)

Question 11

A researcher finds a transposon with terminal inverted repeats (TIRs) and an open reading frame for transposase. What type of transposon is this?

Accepted Answer

Autonomous DNA transposon

Question 12

Which of the following best explains the 'copy and paste' mechanism of transposon movement?

Accepted Answer

The transposon is replicated, and a new copy is inserted at a new site, leaving the original intact

Question 13

Which of the following equations best represents the increase in transposon copy number after $$n$$ rounds of replicative transposition, starting with $$C_0$$ copies?

Accepted Answer

$$C_n = C_0$ 	imes 2^n$$

Question 14

Which of the following is NOT a function or consequence associated with transposable elements in the human genome?

Accepted Answer

Direct synthesis of ribosomes

Question 15

A patient is diagnosed with colon cancer. Which of the following mechanisms involving transposable elements could contribute to cancer development?

Accepted Answer

Transposon insertion into a tumor suppressor gene, disrupting its function

Question 16

Which of the following statements about SINEs (Short Interspersed Nuclear Elements) is correct?

Accepted Answer

SINEs are nonautonomous and require enzymes from other elements for mobility

Question 17

Which of the following is a real-world example of a transposon causing a visible phenotype in an organism?

Accepted Answer

Variegated kernel color in maize due to transposon movement

Question 18

Which of the following best describes the role of target site duplication in transposon integration?

Accepted Answer

It is a result of staggered nicks made by transposase and subsequent gap filling

Question 19

Which of the following is true regarding the origin of retrotransposons?

Accepted Answer

They originated from retroviruses

Question 20

A geneticist observes a chromosomal rearrangement involving transposons on nonhomologous chromosomes. What is the most likely event?

Accepted Answer

Translocation

Transposable Genetic Elements: Structure, Function, and Impact

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